EXCITED STATES OF 11C FROM n–γ ANGULAR CORRELATK AND GAMMA BRANCHING RATIOS

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Abstract
An experimental study of excited states of 11C below 6.5 MeV has been made using the 10B (d, nγ)11C reaction at a deuteron bombarding energy of 0.8 MeV. Measurements were made of the n–γ angular correlations of the ground-state gamma transitions from the 6.49- and 4.32-MeV levels, and of the gamma-ray branching ratios from the 6.49-, 4.81-, and 4.32-MeV levels.Theoretical analysis of the n–γ angular correlations suggests that the J values of the 6.49- and 4.32-MeV levels are (3/2), (5/2), or (7/2). The parities of all the states observed in this experiment are already known to be negative from high-energy stripping data. A comparison of the experimental branching ratios with theoretical branching ratios predicted by the intermediate coupling shell model is consistent with the following spin and parity assignments in 11C: ground state (3/2)−, 2.00 MeV (1/2)−, 4.32 MeV (5/2)−, 4.81 MeV (3/2)−, and 6.49 MeV (7/2)−.

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